Demo viewsheds

Interactive viewshed map for validation viewshed in Cobar NSW

Comparing viewscape::compute_viewshed() which does not implement Earth curvature or atmospheric refraction compensation, and terra::viewshed() which does.

Mythical 48m high tower viewpoint.

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Consider this article

https://www.sciencedirect.com/science/article/pii/S016920462200072X